body {
  text-align: center;
}

#text {
  font-size: 12px;
  cursor: default;
  -webkit-user-select:none;
  -moz-user-select:none;
  -o-user-select:none;
  user-select:none;
}
.node-active{
  stroke: #555;
  stroke-width: 1.5px;
}
.path-middle,
.path-top,
.path-bottom {
  stroke-opacity: .3;
}
.link-active {
  stroke-opacity: 1;
}
.node-hide {
  fill-opacity: .3;
}